March 2, 2023 at 10:04 amshubhali_sSubscriber
Hello dear all,
we are simulating gas liquid two-phase flow in a bubble column in ANSYS Fluent 2022 R1. We are performing simulations to study mass transfer effects from gas phase to liquid phase for constant small bubble size using Eulerian multiphase model and by enabling MT module. (snapshot is attached)
Many terms from attached panel are not clearly understood for example -
How can we set mass transfer effects using phase interaction in multiphase model?
we are unable to understand the units for the option "constant-rate", there is no specific equation described in Ansys theory guide.
we have tried using constant kla (1/s) value from research paper in reputed journal but it diverged.
By default the panel is set for liquid to gas, so how should we proceed for gas to liquid mass transfer.
Not much detail is given in Ansys theory guide and User guide.
March 2, 2023 at 12:52 pmSRPSubscriber
For details regarding the equations, please refer to fluent theory guide: 14.7.2. Unidirectional Constant Rate Mass Transfer (ansys.com)
Ansys Fluent provides a UDF that you can use to input models for different types of mass transfer, for example, evaporation, condensation, boiling, and so on. Note that when using this UDF, Ansys Fluent will automatically add the source contribution to all relevant momentum and scalar equations. This contribution is based on the assumption that the mass "created" or "destroyed" will have the same momentum and energy of the phase from which it was created or destroyed.
If you are not able to access the link, please refer to this forum discussion: https://forum.ansys.com/forums/topic/using-help-with-links/#latest
March 2, 2023 at 4:35 pmRobAnsys Employee
You may find the sign of the rate (+/-) helps with which way the material is transferred. The From->To is for numerical reasons and to help make sure the formation energy doesn't give the wrong sign.
- You must be logged in to reply to this topic.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Suppress Fluent to open with GUI while performing in journal file
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Getting graph and tabular data from result in workbench mechanical
- The solver failed with a non-zero exit code of : 2
- Difference between K-epsilon and K-omega Turbulence Model
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error in cfd post
© 2023 Copyright ANSYS, Inc. All rights reserved.